Gorilla Diamond Abrasive Pads For: Natural Stone, Terrazo, Marble, Granite, Concrete & VCT*Blue Pads, 200 Diamond Grit For:- Most aggressive- For damaged floors or use after grinding- HD removal of scratches & discoloration on stone*Only 3000, 8000, 11000 grit Diamond by Gorilla are suggested for VCT.Each Gorilla Pad will average about 30,000 square feet of floor coverage before being thrown away. Since many floor restoring applications require up to 10 passes, you may consider that each pad will do about 3,000 square feet of floor. Thats 10 passes over 3,000 square feet for a total usage of 30,000 square feet approximately.